Improvement in balanced slide-valves for steam-engines



0. KROMER.

Balanced Slide-Valves for Steam-Engines.

Patented Jan. 27, 1874.

fyi@ zsheers--sheet 2.

o. KRUMER. .Balanced Slide-Valves, for Steam-Engines"I TdG-146,915. Patented Ja 1n.27,187 4.

UNITED STATES PATENT EEICEo OTTO KROMER, OF SANDUSKY, OHIO.

' IMPROVEMENT IN BALANCED SLIDE-VALVES FOR STEAM-ENGINES.

Specification forming part of Letters Patent N 0. 146,915, dated J annary 27, 1874; application tiled September 15, 1873.

GAsE B.

of friction but little greater than is due to its weight, such friction being borne by gibs interposed between the valve and shoulders upon its seat. The invention consists in a'saddleshaped valve fitted over a double-faced valveseat of corresponding form, having openings or ports on both faces, communicatingwith the side pipes, the top of the valve having two adjustable gibs interposed between it and ilat shoulders upon the top of the seat, permitting the valve to be so adjusted as to bear upon the seat-faces sufficiently to work steam-tight, the remaining stress being borne by the said gibs. In engines having automatic expansion -gear, and fitted with independent induction and eduction valves, the seats may be V-shaped and' hollow, with ports in their iuner faces, between which vplays a cast-iron V- shaped valve, having corresponding ports, and a flange at each side projecting over the top edges of the seat, between which, however, adjustable gibs are interposed, to take the wear and friction dueto theweight of the valve.

Figure 1 is aperspective view of a horizontal engine iittedpwith lmy, improved slide-valve,

j a portion of the steam-chest being broken away to show it. y lFig.\2'is a longitudinal vertical section taken,V lon in Fig. l. Fig. 3 is a cross-section on theline jz/ y in Fig. 2 and Fig. 4, which latter isa' horizontal section on the plane z z in Figs. l, 2, and 3. Fig. 5 is a perspective view, showing a modification of the valve and seat, more especially adapted to engines having independent induction and eduction valves. Fig. 6 is a cross-section of the same on o 'v in Fig. '5. Fig. 7 is a horizontal Section taken on the plane w w in Figs. 5 and 6.

Like letters refer to like parts in the several figures.

In the drawing, A represents the cylinder of a steam-engine, having cored in its top the side pipes or steam-passages d d and the exhaustbelt b. B is the steam-chest, inclosing the double-faced seat C, which is in the form of a rectangular prismoid, with a longitudinal groove or depression along the middle of the top, to allow the boss on the under surface of the valve D, with which the valve-stem D2 enl gages, to play freely. On each side or face of the seat is an exhaust-port, b', communicating with the exhaust-belt b, and at each side of it a port, al, communicating with one of the side pipes a. The valve D is a saddle-shaped casting, tted over the seat, with an exhaust-cavity, o, molded in the inner face of each of its sides. Between the top of the seat and the under surface of the middle web of the valve are interposed two gibs, E E,with temper-screws d cl, tapped through the back of the valve, to bear upon them, and support the valve in such adjustment with relation to the faces of thc seat as that 4the valve will work steam-tight against them. As the pressure of the steam is exerted upon both sides ofthe valve, it is evident that the valve is balanced, and the seat relieved from all pressure except that upon the differential areaV of the top and bottom of the valve, and that due to the weight of the valve.l This pressure is carried upon the gibs, which, as they become worn, can have the pressure continued upon them by turning down the temper-screws, so that the valve being properly faced to its seats in the first instance, can be kept so.

When either port in the seat, or rather pair of opposing ports, are disclosed by the valve, to give steam to that end of the cylinder, the other steam-ports are included within the eX- haust-recesses of the valve, which thus opens communication with the eduction-pipe for the exhaust steam.

In Fig. 5 is shown a modified form of valve, also cast solid, and more especially intended for engines having independent induction and eduction valves. In this case the valve-seat C is placed crosswise of the cylinder, and is hollow or chambered, with ports cut through .its inner faces7 communicating with the cylinder-ports through a port, a?, in its bottom. D1 is a V-shaped Valve, tted to and playing` between the faces of the sea-t7 with iian ges at its v sides projecting over the ton sides of the seat,

with gibs E interposed. Te1npcr-scre\\'s (l d are tapped through each flange ofthe valve to transfer its weight and pressure to the gibs, which thus take all the Wear, this valve, like the first, being practically balanced. lt has as many ports cut through each side7 less one7 as there are ports in the scat, which insures a quick and full opening With a short throw oi' the valve.

By making these valves as single castings, they are much stronger and cheaper than valve-plates held asunder by struts and staybolts.

VVhat I claim as my invention7 and desire to secure by Letters Patent, s-

rlhe saddle-shaped ValVeD, cast in one piece, and provided with the exhaust-cavities c, the gibs E E, and temper-screws d d, in'connection with the double-faced seat C, provided with the ports nl Zi', substantially as described and shown.

OTTO KROMER. Vitucsses:

AUGUST KLoTz, Jos. F. KILBY. 

